Chemistry, grade 11

Question

What is the number of valence electrons of gallium Ga (Z = 31)? Write its electron configuration and give the four quantum numbers of these electrons of valence

Answer 1

Gallium electron configuration:

1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p1

The valence electrons are the 4s2 and 4p1 electrons for a total of THREE valence electrons.

The quantum numbers for these are:

For the 4s electrons: n = 4, l = 0, m_i = 0, s = +1/2 and -1/2

For the 4p electron: n = 4, l = 1, m_l =-1, s = +1/2